Jul 2016 updated: Pass4sure Oracle 1z0-808 question 1-10

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Q5. Which three statements are true about the structure of a Java class?

A. A class can have only one private constructor.

B. A method can have the same name as a field.

C. A class can have overloaded static methods.

D. A public class must have a main method.

E. The methods are mandatory components of a class.

F. The fields need not be initialized before use.

Answer: A,B,C

Explanation: A: Private constructors prevent a class from being explicitly instantiated by its

callers.

If the programmer does not provide a constructor for a class, then the system will always

provide a default, public no-argument constructor. To disable this default constructor,

simply add a private no-argument constructor to the class. This private constructor may be

empty.

B: The following works fine:

int cake() {

int cake=0;

return (1);

}

C: We can overload static method in Java. In terms of method overloading static method

are just like normal methods and in order to overload static method you need to provide

another static method with same name but different method signature.

Incorrect:

Not D: Only a public class in an application need to have a main method.

Not E:

Example:

class A

{

public string something;

public int a;

}

Q: What do you call classes without methods? Most of the time: An anti pattern.

Why? Because it faciliates procedural programming with "Operator" classes and data

structures. You separate data and behaviour which isn't exactly good OOP.

Often times: A DTO (Data Transfer Object)

Read only datastructures meant to exchange data, derived from a business/domain object.

Sometimes: Just data structure.

Well sometimes, you just gotta have those structures to hold data that is just plain and

simple and has no operations on it.

Not F: Fields need to be initialtized. If not the code will not compile.

Example:

Uncompilable source code - variable x might not have been initialized

Up to the immediate present 1z0-808 test engine:

Q6. Given:

And given the code fragment:

What is the result?

A. 4W 100 Auto 4W 150 Manual

B. Null 0 Auto 4W 150 Manual

C. Compilation fails only at line n1

D. Compilation fails only at line n2

E. Compilation fails at both line n1 and line n2

Answer: E

Explanation:

On line n1 implicit call to parameterized constructor is missing and n2 this() must be the first line.

Q7. Given the code fragment:

What is the result?

A. 28false29 true

B. 285 < 429 true

C. true true

D. compilation fails

Answer: C

Q8. Given:

A. X XX

B. X Y X

C. Y Y X

D. Y YY

Answer: D

Q9. Given:

What is the result?

A. myStr: 9009, myNum: 9009

B. myStr: 7007, myNum: 7007

C. myStr: 7007, myNum: 9009

D. Compilation fails

Answer: C

Q10. Which statement is true about the default constructor of a top-level class?

A. It can take arguments.

B. It has private access modifier in its declaration.

C. It can be overloaded.

D. The default constructor of a subclass always invokes the no-argument constructor of its superclass.

Answer: D

Explanation: In both Java and C#, a "default constructor" refers to a nullary constructor that is automatically generated by the compiler if no constructors have been defined for the class. The default constructor is also empty, meaning that it does nothing. A programmer-defined constructor that takes no parameters is also called a default constructor.